No. A decade is 10 years.
"twice per decade" = 2 / 10 years = 1nce per five years
A decade is ten years. Half a decade is five years.Therefore. four decades are forty years, plus the five years, totalling forty-five years (45 years).
Half a Decade
A synonym for every five years is quinquennial: as an adjective describes something that happens every five years or that lasts for five years; the noun means the fifth anniversary or a period of five years.
One decade is ten years. Thus, five decades would be 50 years.
It's just five years, but you could say "Half a decade" if you want to be fancy.
It's just five years, but you could say "Half a decade" if you want to be fancy.
lustrum, pl = lustra http://www.thefreedictionary.com/lustrum
3 scores, one decade, five years seven decades five years 7.5 decades .75 centuries a senior
In 1 decade there are 10 years, so in 5 decades there are 50 years.
10 years is called a decade hence it is only a decade not decade of years
A decade is 10 years so50/10 = 5So they're five decades in 50 years.